JP6402262B2 - Packaging machine and method for manufacturing packages from packaging materials - Google Patents

Description

  The present invention relates to a packaging machine for producing a package from a packaging material. In particular, the invention relates to a packaging machine comprising a control device for controlling the position of a tube formed by folding a packaging material and filled with a product to be packaged.

  The invention also relates to a method for manufacturing a package from a packaging material.

  Packaging machines for packaging injectable food products such as fruit juice, wine, tomato sauce, pasteurized milk or long-term storage (UHT) milk are known, in which the packaging material is sealed vertically A package is formed from a continuous tube defined by the web.

  The packaging material has a multi-layered structure with a layer of paper material covered on both sides by a layer of heat-seal plastic material such as polyethylene, for example in the case of aseptic packaging of long-term storage products, for example UHT milk, It also includes a layer of barrier material defined by an aluminum film, which is overlaid on the layer of heat-seal plastic material and then separates the heat-seal plastic material that defines the inner surface of the package that will ultimately contact the food. Covered by a layer of.

  The packaging material has a plurality of crease lines, and the packaging material is folded along the crease line to obtain the package. The final shape of the package depends on the pattern of crease lines in the packaging material.

  To produce such a package, a web of packaging material is unwound from a reel and fed through a sterilization unit, in which a liquid sterilant, for example, typically concentrated hydrogen peroxide and an aqueous solution Sterilized by soaking in.

  Once the web is sterilized, the sterilant is removed from the surface of the packaging material, for example by evaporation by heating, and the web of packaging material so sterilized is maintained in a closed sterile environment, It is bent and sealed in the longitudinal direction to form a tube.

  More specifically, the web of packaging material is fed out vertically through several successive forming assemblies, and these assemblies interact with the web and bend it. To be cylindrical. More specifically, the forming assembly includes respective folding members that define a number of forced passages that gradually change from a C-shape with an open cross-section to a generally circular shape.

  By interacting with the folding member, the opposite sides of the web are superimposed on the other top to form a tube.

  At the sealing station downstream of the folding assembly, the overlapping web sides are heat sealed to each other to form a longitudinal seal of the tube.

  This tube is continuously filled with injectable food and then sent to a forming and lateral sealing unit to form a separate package, where the tube is gripped between the pair of jaws to hold the tube Seal in the lateral direction to form a pillow pack.

  The pillow packs are cut off by cutting the sealed portion between the pillow packs and then fed into a final folding station where they are mechanically folded into a final shape.

  A predetermined or desired angle of the tube with respect to its axis and with respect to the structure of the packaging machine to ensure excellent lateral sealing of the tube of packaging material and accurate folding of the pillow pack along the crease line Need to be paid out to a position. When the packaging material tube is sealed laterally, specifically using an ultrasonic sealing device, the overlapped sides of the web are each formed in a counter element facing the operating element of the sealing device. The packaging material is gripped under pressure between these two elements. Otherwise, this can adversely affect the quality of the seal because the contact pressure between the operating and counter elements of the sealing device and the packaging material will be incorrectly distributed.

  In addition, if the tube of packaging material is twisted about its own axis to a predetermined or desired angular position, the crease line is formed and aligned with the paired jaws of the transverse sealing unit Therefore, there is a possibility that the forming action of the package is reduced. Specifically, if the pair of jaws folds the packaging material in that region, which is different from the crease line, the package will have a slightly curved longitudinal edge, which may be unsightly. is there.

  In known packaging machines, the angular position of the tube may change in practical use due to the web's side edges not being perfectly straight and the impact of the paired jaws on the tube.

  In order to allow adjustment of the angular position of the tube in order to minimize deviation of the tube angle relative to a predetermined or desired angular position, the folding member of one forming assembly is formed on the tube formed. It is connected to the structure of the packaging machine in such a way that the angle can be adjusted around the axis. However, this involves a periodic inspection of the package that is performed manually by the operator at the start of this cycle and, if necessary, output from the machine.

  Thus, the corrections made by the operator will take a relatively long time, usually in the range of a few minutes, and given the high production speed of the packaging machine, a relatively large number of packages at the end of this cycle. Will be rebounded.

  An object of the present invention is to improve the positioning operation of a packaging material in a packaging machine.

  Another object of the present invention is to improve the positioning of the tube of packaging material in the packaging machine.

  Yet another object of the present invention is to prevent the tube of packaging material from twisting about its own longitudinal axis in a packaging machine.

  According to a first aspect of the present invention there is provided a packaging machine for producing a package from a packaging material as claimed in claim 1.

  In a second aspect of the present invention there is provided a method for manufacturing a package from packaging material as set forth in claim 10.

  Preferred non-limiting embodiments of the present invention will now be described by way of example with reference to the accompanying drawings.

1 is a perspective view of a packaging machine for manufacturing a package from a packaging material according to the present invention, with some parts removed for clarity. FIG. It is a schematic side view of the packaging machine of FIG. FIG. 2 is a schematic top view of the packaging machine of FIG. 1 in a working configuration. FIG. 2 is a schematic top view of the packaging machine of FIG. 1 in a different work configuration. FIG. 2 is a schematic top view of the packaging machine of FIG. 1 in a different work configuration. It is a perspective view of the drive part of the packaging machine of FIG. It is another perspective view of the drive part of FIG. It is a block diagram which shows the control loop mechanism of the packaging machine of FIG.

  Referring to FIGS. 1 to 7, pasteurized or uninjectable foods such as UHT milk, fruit juice, wine, etc. from a packaging material 3 unwound from a reel (not shown) and fed along a traveling path P. A packaging machine 1 for continuously producing a sealed package 2 contained therein is disclosed. When unwound from the reel, the packaging material has the shape of a flat web 100.

  Utilizing known guide elements, rollers or similar devices (not shown), the web 100 is provided with a sterilization tank 102 (shown schematically in FIG. 2) along the path of travel P. It goes out to pass through.

  In another embodiment (not shown), the sterilization unit may comprise other sterilization devices, for example sterilization devices that irradiate the packaging material 3 with a low-pressure electron beam.

  The web 100 is unrolled to pass through the chamber 4 (indicated by the dotted line in FIG. 1) along the travel path P, which is a part of the stationary structure 5 (partially shown in FIG. 1) of the packaging machine. In which the web 100 is maintained in a sterilized air environment.

  The chamber 4 comprises an upper part 6, which is in communication with the sterilization unit 101, in which the web 3 is guided along the vertical part P1 and from the upper part 6 along the part P1 vertically in the lower part. 8 is extended.

  Within the lower part 8, the web 3 is folded longitudinally into a cylindrical shape, forming a continuous vertical tube 9 having a longitudinal axis A coaxial with the part P1, and gradually into a number of sealed packs 10. This pack is subjected to a continuous mechanical folding process (not shown since it does not form part of the present invention) to form the final package 2. In detail, the packaging machine 1 comprises a forming and transversal sealing unit, in which the tube 9 is folded and sealed by interacting with the tube 9 to obtain the pack 10. It has a pair of jaws.

  The packaging machine 1 comprises several forming assemblies, in the illustrated embodiment four forming assemblies, ie a first forming assembly 11 carried by the structure 5, a second forming assembly 12, 3 forming assembly 13 and fourth forming assembly 14 are arranged along the portion P1 inside the chamber 4 and interact with the web 100 to bend the web 100 in stages. The tube 9 is formed by making the first side part 100a of the web 100 and the second side part 100b of the web 100 opposite to the first side part 100a overlap each other.

  In the embodiment shown, the first forming assembly 11 is housed inside the upper portion 6 along the portion P1, and the second forming assembly 12, the third forming assembly 13 and the fourth forming assembly. The assemblies 14 are arranged in sequence along the part P1 inside the lower part 8.

  The packaging machine 1 also comprises a sealing device 15 (shown schematically in FIG. 1) arranged along the part P1 downstream of the fourth forming assembly 14, which is superimposed on the first By sealing the side part 100a and the second side part 100b, a liquid-tight vertical seal is formed in the tube 9.

  Utilizing an infusion tube 20 that extends partially inside the tube 9 and forms part of a filling circuit (not shown), the tube 9 is continuously fed by sterilized or sterilized food. Is satisfied.

  In the formation and lateral sealing unit (not shown) referred to above, the tube 9 is then sealed and cut along an evenly spaced cross section to form the pack 10 from which the package 2 is manufactured. The

  Referring to FIG. 1 in detail, the first forming assembly 11 includes a plurality of first folding rollers 21 having an axis orthogonal to the portion P1. A side surface 21 a of the first folding roller 21 defines a first forced path 25 for the web 100 to be folded.

  Similarly, the second forming assembly 12 includes a plurality of second folding rollers 22 having an axis orthogonal to the portion P1. The side surface 22a of the second folding roller 22 defines a second forced path 26 for the web 100 to be folded.

  In a similar manner, the third forming assembly 13 includes a plurality of third folding rollers 23 having an axis orthogonal to the portion P1. The side surface 23 a of the third folding roller 23 defines a third forced path 27 for the web 100 to be folded.

  Similarly, the fourth forming assembly 14 includes a plurality of fourth folding rollers 24 having an axis orthogonal to the portion P1. The side surface 24a of the fourth folding roller 24 defines a fourth forced path 28 for the web 100 to be folded.

  More specifically, the first forced passage 25, the second forced passage 26, the third forced passage 27, and the fourth forced passage 28 are formed by the first folding roller 21. The cross section gradually changes along the portion P1 from the open C-shape defined to the substantially circular shape defined by the fourth folding roller 24.

  Referring to FIGS. 2 to 7, the packaging machine 1 controls the angular position of the tube 9 formed with respect to the axis A, that is, controls for controlling rotation or twisting around the axis A of the tube 9. A device 30 is provided.

  The control device 30 moves the web 100 in a direction T determined to be transverse to the traveling path P.

  The control device 30 includes a drive roller 31 that supports the web 3. In other words, the web 30 is in contact with the driving roller 31 and a part of the web 30 is wound around it.

  The drive roller 31 is positioned upstream of the sterilization unit 101.

  Since the drive roller 31 is rotatable about the rotation axis B and is supported by the movable bracket 32, the rotation axis B can rotate in a plane W defined by the web 100.

  With reference to FIGS. 6 and 7, the control device 30 includes a fixed frame 33 with a plate 34 that supports a bracket 32.

  The bracket 32 includes a first side 35 hinged to the first slide 36 and a second side hinged to the second slide 38 opposite the first side 35. 37.

  The control device further includes a first guide element 39 connected to the first portion 40 of the plate 34 and a second guide 42 connected to the second portion 42 of the plate 34 opposite the first portion 40. And a guide element 41.

  The first slide 36 is slidable along the first guide element 39.

  The second slide 38 is slidable along the second guide element 41.

  The first guide element 39 is arranged along a first sliding direction F inclined with respect to the rotation axis B.

  The second guide element 41 is disposed along the second sliding direction G that is inclined with respect to the rotation axis B.

  The first sliding direction F and the second guide direction G converge toward each other.

  The control device 30 further comprises an actuating device 47 for moving the first slide 36 along the first guide element 39 and moving the second slide 38 along the second guide element 41.

  In the embodiment shown, the actuating device 47 comprises a drive element 43 connected to the frame 33 and a shaft 44 slidable within the drive element 43 and provided with an end 45 coupled to the lever 46. Have

  The lever 46 is connected to the first slide 36. In this method, when the shaft portion 44 is extended from the drive element 43, the first slide 36 and the second slide 38 are moved from right to left in FIG. 6, and the drive roller 31 (rotation axis B) is counteracted. Rotate in the face W clockwise. When the shaft portion 44 is retracted into the drive element 43, the first slide 36 and the second slide 38 move from left to right in FIG. 6, and the drive roller 31 (rotation axis B) faces clockwise. Rotates within W.

  The packaging material 3 includes a plurality of crease line patterns (not shown), and the packaging material 3 is bent along this to produce the package 2.

  The pattern of the crease lines is the same as each other, and is sequentially arranged along the vertical dimension of the packaging material 3.

  In this method, the packaging material comprises a plurality of packaging material units 50 (schematically shown in FIGS. 3 to 5), each packaging material unit 50 being intended to form a package 2. .

  The packaging material 3 is also provided with a plurality of fiducial marks 51, which give an indication of the location of the packaging material 3, in particular the location of the packaging material unit 50.

  Each packaging material unit 50 has a corresponding mark 51 arranged at a fixed position with respect to the pattern of crease lines of the packaging material unit 50. In this method, the position of the mark 51 provides accurate information regarding the position of the crease line pattern.

  The mark 50 may be a magnetic mark that holds position information that provides a magnetic field.

  The mark 50 may be realized by magnetizable ink that is spread on the packaging material 3 when the decoration is printed on the packaging material 3. Since this ink is magnetized after a crease is made in the packaging material 3, the position of each crease pattern coincides with the position of the corresponding mark 50.

  The control device 30 further comprises a first sensor 52 arranged to detect the position of the edge 53 of the web 100. In the embodiment shown, the first sensor 52 detects the position of the second side edge 100b.

  The first sensor 52 generates a first control signal S <b> 1 that informs the deviation of the position of the edge 53 along the lateral direction T with respect to the reference edge position X.

  The control device 30 is further adapted to detect the position of the mark 50 and to generate a second signal S2 indicative of the rotation of the tube 9 about the axis A relative to the reference tube position Y. A sensor 54 is provided.

  Specifically, the second sensor 54 may be a magnetic sensor.

  FIG. 3 shows that the edge 53 is in the reference edge position X, i.e. there is no displacement along the transverse direction T, and the tube is in the reference tube position Y, i.e. completely around the axis A. A desired work configuration D that is not rotating is shown.

  During operation, the packaging material 3 may move and deviate from the desired working configuration D.

  In such a case, the control device 30 acts on the packaging material 3 so as to move the packaging material 3 towards the desired working configuration D.

  Specifically, as shown in FIG. 4, if the drive roller 31 is rotated clockwise in the plane W via the actuating device 47, the web 100 is directed to the left along the transverse direction T. As a result, the tube 9 rotates around the axis A counterclockwise.

  Conversely, as shown in FIG. 5, if the drive roller 31 is rotated in the face W counterclockwise via the actuating device 47, the web 100 is directed to the right along the transverse direction T. As a result, the tube 9 rotates around the axis A in the clockwise direction.

  Referring to FIG. 8, the control loop mechanism of the packaging machine of FIG. 1 is disclosed.

  The control device 30 includes an edge set point 55, i.e. a first set point of the first sensor 54 corresponding to a reference edge position X, for example, and a tube set point 56, i.e. A logic control unit is provided that receives as input data a second set point of the second sensor 54 corresponding to the tube position Y.

  The first sensor 52 generates a first control signal S1 that informs the position of the edge 53 along the lateral direction T.

  The first control signal S 1 is filtered by the first filter 57.

  The first control signal S1 is transmitted to a first PID (proportional-integral-derivative) control device 59 which controls the drive roller 31, i.e. rotation in the plane W via the actuating device 47. Another first control signal S1 ′ for controlling the inclination of the axis B is generated.

  The second sensor 54 generates a second signal S2 that informs the rotation of the tube 9 about the axis A.

  The second signal S2 is filtered by the second filter 58.

  The second signal S2 is sent to a second PID (proportional-integral-derivative algorithm) controller 60, which is sent to a first PID (proportional-integral-derivative) controller 59. A second control signal S2 ′ is generated.

  The first PID (proportional-integral-derivative) controller 59 receives the first control signal S1 and the edge set point 55 as input information, and receives the first control signal S1 and the edge set point 55. And another second signal S2 ′, which is also input information to the first PID (proportional-integral-derivative) controller 59, is taken into consideration to generate another first control signal S1 ′. .

  The second PID (proportional-integral-derivative) control device 60 receives the second signal S2 and the tube set point 56 as input information, and compares the second signal S2 with the tube set point 56. Then, another second signal S2 ′ is generated.

  As explained above, the first PID (proportional-integral-derivative) control device 59 is not only based on the edge set point 55 and the first control signal S1, but also in consideration of tube rotation. Based on the second signal S2 ′, another first control signal S1 ′ is generated.

  This is because the driving roller 31 moves the web 100 along the transverse direction T to such an extent that not only the movement of the edge 53 with respect to the reference edge position X but also the rotation of the tube 9 with respect to the reference tube position Y is corrected. Means to move.

  Thanks to the invention, it is possible to minimize the twisting of the tube by correcting the position of the tube 9 during operation of the packaging machine.

  Since the drive roller 31 and the actuating device 47 are positioned upstream of the sterilization unit 101, they do not cause contamination of the packaging material 3.

  Obviously, modifications may be made to the packaging machine 1 described and illustrated herein without departing from the scope of the appended claims.

Claims (8)

A packaging machine for producing a package (2) from a web (100) of packaging material (3) advanced along a travel path (P), the packaging material being along the travel path (P) In a packaging machine having a longitudinal edge (53) arranged and a mark (50) arranged to provide an indication of the position of the packaging material (3),
A forming unit for bending the packaging material (3) into a tube (9) having a longitudinal axis (A) arranged along the travel path (P);
Sealing the first side (100a) of the web (100) and the second side (100b) of the web (100) opposite the first side (100a) A sealing device (15), wherein the first side (100a) and the second side (100b) are superimposed to form a liquid-tight longitudinal seal on the tube (9); A sealing device (15);
A first sensor (52) arranged to detect the position of the edge (53) and generate a first control signal (S1);
A second sensor (54) arranged to read the mark (50) and generate a second signal (S2);
Based on the first control signal (S1) and the second signal (S2), the packaging material (3) is moved in the lateral direction (T) positioned laterally with respect to the travel path (P). A control device (30) having drive elements (31, 47) arranged at a position where the first control signal (S1) is located at the edge (53) along the lateral direction (T) A control device (30),
The second signal (S2) indicates rotation of the tube (9) about the longitudinal axis (A), and the control device (30) comprises a logic control unit, the logic control unit Receives a first control signal (S1) as input information and generates a first PID (proportional-integral-) for generating another first control signal (S1 ′) for controlling the driving element (31). A differential control unit (59), wherein the logic control unit receives the second control signal (S2) as input information and is sent as input information to the first PID control unit (59). A second PID control device (60) for generating a second control signal (S2 '), wherein the drive element rotates about a rotation axis (B), and the packaging In the plane (W) defined by the material (3) Possess an actuating device for tilting the axis of rotation (B) (47),
The first PID control device (59) includes a first sensor (52) corresponding to an edge reference position (X) of the edge (53) along the lateral direction (T). Further receiving a set point (55) as input information, comparing said first control signal (S1) with said first set point (55) and said another second signal (S2 ') A packaging machine that generates said further first control signal (S1 ') by taking into account .   The packaging machine according to claim 1, wherein the mark (50) is a magnetic mark holding a magnetic field providing position information, and the first sensor (52) is a magnetic sensor. The second PID control device (60) sets the second setting of the second sensor (54) corresponding to the tube reference position (Y) of the tube (9) around the longitudinal axis (A). further receiving the point a (56) as input information, by comparing the previous SL second signal (S2) and the second set point (56), generating the different second signal (S2 ') The packaging machine according to claim 1 or 2 . Has said packaging material (3) further sterilization unit (101) for sterilizing said drive element (31,47) comprises is disposed upstream of the sterilization unit (101), Claims 1 to 3 The packaging machine according to any one of the above. The control device (30) is a bracket (32) rotatably supporting the drive roller (31), the first side (35) hinged to the first slide (36); A bracket (32) having a second side (37) hinged to a second slide (38) opposite the first side (35);
The control device (30) includes a first guide element (39) connected to a first part (40) of a stationary frame (33), opposite the first part (40); A second guide element (41) connected to a second part (42) of the fixed frame (33);
The first slide (36) is slidably coupled to the first guide element (39), and the second slide (38) is relative to the second guide element (41). The first guide element (39) is disposed along a first sliding direction (F) inclined with respect to the rotational axis (B), and the second guide element (39) is slidably coupled. A guide element (41) is arranged along a second sliding direction (G) inclined with respect to the rotational axis (B), and the actuating device (47) is arranged on the first slide (36). are moved along the first guide element (39) to move said second slide (38) along said second guide element (41), one of the claims 1 to 4 one The packaging machine according to item. A method for producing a package (2) from a web (100) of packaging material (3) advanced along a travel path (P), wherein the packaging material is disposed along the travel path (P) A longitudinal edge (53) formed and a mark (50) arranged to provide an indication of the position of the packaging material (3),
Bending the packaging material (3) into a tube (9) having a longitudinal axis (A) arranged along the travel path (P);
The first side (100a) of the web (100) and the second side (100b) of the web (100) on the opposite side of the first side (100a) ), Wherein the first side (100a) and the second side (100b) are overlaid to form a liquid-tight longitudinal seal on the tube (9). When,
Detecting the position of the edge (53) by a first sensor (52);
Detecting the mark (50) by a second sensor (54);
A control device having drive elements (31, 47) based on a first signal generated by the first sensor (52) and a second signal generated by the second sensor (54) (30) moving the packaging material (3) in a lateral direction (T) positioned laterally with respect to the travel path (P), wherein the first control signal (S1) is the lateral direction Showing the position of the edge (53) along (T),
The second control signal (S2) indicates rotation of the tube (9) about the longitudinal axis (A), and the method sets the first control signal (S1) to the first Sending to a PID (proportional-integral-derivative) controller (59) to generate another first control signal (S1 ′) for controlling the drive element (31); and the second signal (S2) ) To the second PID controller (60) to generate another second signal (S2 ') that is sent as input information to the first PID controller (59), Actuating the drive element to tilt the axis of rotation (B) in a plane (W) defined by a drive roller (31) rotating about the axis of rotation (B) and the packaging material (3) possess a device (47),
The first PID control device (59) has a first sensor (54) first corresponding to an edge reference position (X) of the edge (53) along the lateral direction (T). Further receiving a set point (55) as input information, comparing the first control signal (S1) with the first set point (55) and obtaining another second signal (S2 '). Generating the further first control signal (S1 ′) by taking into account . The method of claim 6 , wherein the mark (50) is a magnetic mark that retains a magnetic field that provides positional information, and the first sensor (52) is a magnetic sensor. The second setting of the second sensor (54) corresponding to the tube reference position (Y) of the tube (9) around the longitudinal axis (A) by the second PID control device (60). further receiving the point a (56) as input information, by comparing the previous SL second signal (S2) and the second set point (56), generating the different second signal (S2 ') The method according to claim 6 or 7 .